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Proceedings Paper

X-ray mesophase investigation of a class of liquid crystalline side group polymers
Author(s): Dietmar Wolff
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Paper Abstract

The phase behavior of liquid crystalline side group polymethacrylates with azo-chromophores in the mesogens was investigated. Layer periodicities (monolayers or bilayers) of the smectic phases depend on the spacer to tail length ratio. For the polymer where the layer periodicity changes from a monolayer to a bilayer two orthogonal smectic monolayer phases SB and SA1 are metastable. After annealing in the SB phase a crystallization occurs. On annealing in the SA1 phase a transformation into a bilayer SC2 phase takes place. An arrangement of the mesogens in the SA1 and SC2 phases is proposed assuming steric hindrance of the side groups caused by the attachment to the polymethacrylate backbone and ataractic permanent dipolar-induced dipolar forces of neighboring side groups. To prove the results also samples with different dipole moments in the mesogens (ester- and amide- instead of azo-units) and in the tail groups (fluorinated) were studied.

Paper Details

Date Published: 11 March 1996
PDF: 12 pages
Proc. SPIE 2651, Liquid Crystal Materials, Devices, and Applications IV, (11 March 1996); doi: 10.1117/12.235347
Show Author Affiliations
Dietmar Wolff, Technische Univ. Berlin (Germany)

Published in SPIE Proceedings Vol. 2651:
Liquid Crystal Materials, Devices, and Applications IV
Ranganathan Shashidhar, Editor(s)

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